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A powerful typhoon has struck disaster-ravaged Japan, bringing heavy rains and floods that have killed four people.

Typhoon Roke is on course to hit Fukushima, where engineers are still struggling to bring a nuclear plant under control after the March tsunami.

There are concerns that rain could force radioactive water into the sea.

Across Japan more than a million people were urged to evacuate their homes; an advisory was later lifted in one area but 330,000 people remain at risk.

The typhoon made landfall on Wednesday afternoon (0500GMT) in Hamamatsu, scouring its way up the main island of Honshu, bringing high winds and torrential rain.

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